<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .box1 {
        width: 200px;
        height: 200px;
        background-color: #bfa;
        margin: 50px;
        float:left;
      }
      /* .fa::after{
        content: "";
        clear: both;
        display: table;
      } */
      .fa{
        /* margin: 50px; */
        width:400px;
        height: 400px;
        background-color: silver;
        /* border: 1px dashed; */
      }
    </style>
  </head>
  <body>
    <div class="fa">
      <div class="box1"></div>
    </div>
    
  </body>
</html>
